Flex I/O Terminal Base Unit Allen-Bradley 1794-TB3 - 3 Strips

Product Overview

The 1794-TB3 is a Flex I/O Terminal Base Unit from Allen-Bradley. It provides termination points for field devices and power supply. This base unit hosts compatible Flex I/O modules. It has three screw-clamp terminal strips. The top strip has 16 I/O terminals. The middle and bottom strips have 18 common and supply terminals each. The total number of terminals is 52. The unit supports daisy-chaining to adjacent bases. It carries a rating of 120 VAC and 10 Amperes. The backplane current draw is 640 mA at 5 VDC. This terminal base unit is essential for building a Flex I/O system.

Application Scenarios

Technicians use this terminal base in automation systems. It connects input and output signals from sensors and actuators. The unit works with many Flex I/O modules like 1794-IA8 and 1794-OA16. It fits in control panels on DIN rails. The daisy-chain feature simplifies wiring for multiple modules. This base supports both AC and DC power supplies. It is ideal for manufacturing plants and process control.

Technical Specifications

The 1794-TB3 has a voltage rating of 120 VAC. Maximum current capacity is 10 Amperes. Backplane current draw is 640 mA at 5 VDC. Dimensions are 94 x 94 x 69 mm. Wire size ranges from 0.34 to 3.3 mm^2. Screw torque specification is 0.56 to 0.79 Nm. Isolation voltage is 125V continuous. The unit has three terminal strips with 52 terminals total. It supports daisy-chaining for power supply. Compatible modules include many 1794 series I/O modules. The product weighs approximately 96 grams. Operating temperature range is 0 to 55 °C.

Installation & Maintenance Guide

Mount the terminal base on a DIN rail. Hook the base over the top of the rail. Slide it tight against the adjacent adapter module. Push until it locks into place. Use screw-clamp terminals for wire connections. Tighten screws to 0.56-0.79 Nm torque. Connect I/O wires to the top strip. Connect common and supply wires to middle and bottom strips. Use daisy-chain terminals for power distribution. The unit requires no special maintenance. Keep it clean and free from dust.

Packing List

Each shipment includes one 1794-TB3 terminal base unit. Mounting instructions are also included. The package does not contain Flex I/O modules. Order these separately. We ship via FedEx, UPS, or DHL.